Re: what is the t score for severe osteoporosis
My understanding was that osteoporosis was termed "severe" only if you had had a prior fracture. So "severe osteoporosis" could be anything below -2.5 if-and only if-you had the fracture
Have you had any blood/urine tests or other examinations to determine whether another medical condition is causing your bone density to drop?
Before you do anything, I would suggest reading "The Myth of Osteoporosis" by Gillian Sanson. She has a daughter with BMD measurements similar to yours.
Unfortunately, most pharmaceutical treatments out there have not been evaluated on the pre-menopausal woman. That's why I'd recommend reading and researching before making any decision.
Good luck, and by all means drop in again; we're very helpful on these boards.